EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator:
Net earnings	$ 7.0	$ 17.5	$ 21.7	$ 18.0	$ 8.3	$ 57.1
Less: Preferred stock dividends	(1.4)	0.0			(1.4)	0.0
Net earnings available to common stockholders	5.6	17.5			6.9	57.1
Net Income (Loss) Available to Common Stockholders, Diluted	$ 5.6	$ 17.5			$ 6.9	$ 57.1
Denominator: (shares in thousands)
Denominator for basic earnings per share - weighted-average shares (in shares)	49,112,000	48,873,000			49,057,000	48,835,000
Potentially dilutive shares resulting from stock plans (in shares)	329,000	701,000			428,000	525,000
Denominator for diluted earnings per share - weighted-average shares (in shares)	49,441,000	49,574,000			49,485,000	49,360,000
Net earnings per share:
Basic (in dollars per share)	$ 0.11	$ 0.36			$ 0.14	$ 1.17
Diluted (in dollars per share)	$ 0.11	$ 0.35			$ 0.14	$ 1.16
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive equity awards not included in weighted-average common shares—diluted (in shares)	8,000,000.0				2,900,000
Common Stock, Restricted Stock and Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive equity awards not included in weighted-average common shares—diluted (in shares)	400,000